The donations, disclosed in Federal Election Commission filings, account for almost 75% of the $2.3 million collected by the Endorse Liberty super PAC last month.

They aren't the first donations from the entrepreneur, venture capitalist and hedge fund manager.

Thiel made donations of $150,000 and $750,000 to the super PAC in December, gifts that were disclosed in the committee's year-end filing.

Thiel's $2.6 million in total donations account for 76% of the super PAC's fundraising since it came online late last year, underscoring the ability of deep-pocketed donors to have a major impact on campaign spending.

The donations are just a tiny fraction of the libertarian activist's net worth. In addition to his success at PayPal, which is now owned by eBay (EBAY, Fortune 500), Thiel has made a few other choice business moves.

In 2004, the angel investor put up $500,000 for Facebook's first financing round. At $30 per share, his stake in the social-networking powerhouse is now worth $1.3 billion.